Variable fraction plug



y 1948. R. R. MONDRON ET AL 2,445,533

VARIABLE FRACTION PLUG Filed April 29, 1947 lg 2, 9 q... a

ATTORN s Patented July 20, 1948 UNlTED- STATES PATENT oFFicE v VARIABLE FRACTION PLUG Ralph It. Mondron and Romaine E. Mondron, Mount Vernon, Ohio Application April 29, 1947, Serial No. 744,642

7 Claims. (01.3340) The present invention relates to improvements in glass cutting devices, and more particularly to variable fraction plugs, which are constructed and adaptable for use with the conventional glass cutting table and conventional cutting rule whereby the cutter may be enabled to shift the rule to fractional positions between the table pins in a manner which will facilitate the cutting of fractional sizes of window glass on a standard window glass cutting table.

An object of the invention is to provide a form of plug that will fit in window glass cutting tables with pins which are separated an inch apart, and which can be used with any of the conventional rules of window glass cutting tables.

Another object of the invention is to provide plugs adapted to interlock with the pins and having movable blocks with a calibrated arrangement enabling such blocks to move relatively to the plugs and to the pins to provide a vernier adjustment of positions between the pins, the blocks being constructed and arranged to receive the tip and hook of the cutting rule.

It is a further object of the invention to provide a variable fraction plug that will be capable of adjustment to various, positionsin a matter of seconds and that will enable a window glass cutter to make accurate cutting of all fractional sizes with the speed he will ordinarily cut regular sizes.

With the foregoing and other objects in view, the invention will be more fully described hereinaiter and more particularly pointed out in the appended claims.

In the drawings, in which like parts are denoted by the same reference characters throughout the several views,

Figure 1 is a top plan view of the standard form of glass cutting table and rule with parts broken away and showing an adaptation of the improved variable fraction plugs as constructed in accordance with the present invention.

, Figure 2 Ba fragmentary perspective view of the far edge of the table showing the tip plug engaged with the vertically upstanding pins.

Figure 3 is a similar view of the near edge of the table .with one of the hook plugs shown engaged with the horizontally projecting table pins, and I r v V Figure l is a section takenon the line 4-4 in Figure 1. 7

Referring more particularly to the drawings l designates a standardform of glass cutting table having at the far edge thereof from the cutter a row ll of vertical pins which are spaced from another the distance of one inch, and l2 represents 'a second row of pins at'the'near side of the table which project out horizontally from the table edge in the well known manner and are conventionally spaced from one another the distance of one inch.

The inventionis useful with the standard form of cutting rule I3 having theusual tip [4 at, its far .end and the hook l5 laterally of its handle end.

According to customary practice the tip M of the rule I3 is adapted to engage between pins II which gives the 1" adjustment to the'rule l3 from pin to pin. In a similar manner the hook I5 cooperates in a like manner with the horizontal pins l2 to hook over an appropriate pin and gives the samev 1', adjustment.

y However, the standard table does not offer any fractional adjustments for the rule l3 between the 1" pin positions and it is the purpose of the present invention to provide such. an arrangement;

We accordingly provide one or more sets of variable fraction plugs, two blocks constituting a set. Figure 2 shows one of the plugs which for convenience we might 'call'the tip plug as it cooperates with the tip M of the standard rule 13. This plug is arranged atthefar edge of the table and cooperates with; the upstanding vertical pins The other plug of the pair is shown in Figure 3 and mightbe conveniently termed the hook plug inasmuch as it cooperates with the hook I5 01 the standard rule l3 and is adapted to be engaged'with the horizontal pins I2 at the near edge-of the table.

Referring moreparticularly to Figure 2, the tip pluglcomprises abase block l6 having vertical holes l'l therethrough to enable the base block I 6 tube dropped over a pair or more of the upstanding pins H. Thus the base block l6 may be set at any position along the row of pins 1 l. A setscrew l8 mounted in the back'of thebase block is opposite one, of the holes I1 may bind upon a pinil to hold the plug in the adjusted position. 1 V The base block lfi carries a slide block l9 slidable upon-a bolt or pin 20. A set screw 2| carried by theslide block (9 is arranged to bind against thebolt 20 to maintain the slide block IS in adjusted position relatively to the base block I6. A V or other notch "22 in the inner edge of the slide block 19 is adapted to receive the tip I4 of the cutting rule I3. 7 g a Theslide block I! is mounted in the. cut-away portion 23 formed at the inner longitudinal edge 3 of the base block I6 thus producing inwardly projecting lugs 24 and 25 on the base block I6 in which the ends of the bolt 20 may be mounted whereby the bolt may be spaced inwardly from the longitudinal edge of the cut-away portion 23.

The slide block I9 is inscribed with an index mark 26 movable over a fraction scale 21 inscribed on the upper edge of the base block lfi near the adjacent edge of the slide block I9 which bears the index 26.

Referring more particularly to Figure 3-, the other variable fraction plug comprises a base block 28 having holes 29 horizontally through portions thereof originating at the inner end of the block and adapted to receive a pair or more of the horizontal pins I2 at the near side of the table. A set screw 30 mounted through a side of the block is adapted to engage one of the pins I2 in order to bind the block in the adjusted position; it being understood that the base block 28 may be moved along the near edge of the table to any desired position and engage with any adjacent pair of the pins I 2 where it is affixed by the set screw 30. v A slide block 3i is horizontally movable relatively to the base block 28 in a cut-away portion 32 formed in the outer edge portion of the base block 28 and resulting in the formation of the 'outward-' ly projecting lugs 33 and 34 A bolt or pin 35 is mounted "in the lugs 33 and 34 and the slide block 3| is perforated to slide upon this bolt 35. A set screw 36 threaded into the slide block BI is arranged to bind against the bolt 35 to hold the slide block 3| in adjusted position. --A cylinder block 31 which may also be conveniently carried by the set screw 36 is rotatably or otherwise mounted outwardly of the slide block '3] so as to move back -'and forth therewith.

Vertical slots 38 and 39 are-made through the base block 28 in alignment with the row of pins I2. The slot 38 is so related to the holes 29 thatit extends between pins 12 and the holes '29 engage. adjacent pins and this "central 'sl'ot3'8 is bounded on all horizontal sides by portions of the base "block 28 inasmuch "as it is made'substantially centrally of the block 28. On the other hand the veftical's lot 39 occurs at oneof the holes '29 and {a pin I2 is adapted to extend'across this slot 39 when the plug is mounted upon the table. Also the slot 39 is open through one edge of the base "block 28. The hook 15 f the standard cutting rule I3 may be engaged in one 'or other slot 38 or '39 when such hook I is in alignment'with the pins I2; or when the hook I5 is projected further back toward the operator the cylinderblook 31 is positioned to receive this hook I5.

- An index marking 18 is inscribed upon the top inner edge of the slide block 3| in a position to move over a fraction scale -4I inscribed upon the adjacent upper'ed'ge of the base block'28.

Intheuse of the device theplugs will :probably be in'ade of hard metal and be fitted 'to theta'ble in pairsas indicated generally'l i'gure 1. The

slide block I9' o f the far plug is designed'to fit the 1 tip I I of the cutting rule I3. The slide block I 9 will slide'along the bolt 20 to the desired fraction {indicated by the index 26 inovi'n'g over the scale 21. This move'ment =-may be accomplished by 'first 'backing oif the set screw 2 I shifting the slide block I9 to'the new position which 'may be quick- '-ly -a-chieved'by 'the aid of the index-marking 26 and-scale 2'1 and the utmost accuracy is provided by this arrangement. The set screw is thereupon fastened in the newp'o'sitidnand the tip- I'4"o' f the rule I 3 hasbeen brought to a position between adjacent pins I I. The slide block I9 and scale arrangement enable the tip I4 of the rule I3 to be brought to a great many fractional positions which the standard table does not provide.

The companion plug 28 at the near side of the table will be fitted to the pins l2 and secured thereby by the set screw 30 in a position which may be slightly offset from the bar plug I6 inasmuchas it will be desirable in most instances to have the cylinder block 31 in position to be engaged by the hook 45 of the rule I3 and this hook is offset to the right of the rule in accordance with the standard construction. The cylinder block 3'! will be offset away from the line of the pins I2 by substantially the same distance that the tip I4 is offset from its vertical line of pins II by the fact that it is engaging the slide block I9 of the far plug. This cylinder block 31 with the slide 3| can be adjusted to any fractional intermediate position between adjacent pins I2 in a manner similar and corresponding to the adjustment made of the far plug. Thus the'hook I5 of the rule I13 may be accommodated by the cylinder block 3'! in the position in which the straight edge 'of the rule I3 will be truly transverse of the table to guide the cutting implement in the proper fractional cut.

The near plug can also catch the hook I5 in either of the slots 38 and 39 when a regular size falls on the same fractional sides (such as 20 x 20 without removing the plugs. When such a size occurs the rule I3 will slip over the far plug 56 with its tip :I 4 engaging between the pins -'I I and thus the hook I5 on the handle end of the rule 53 will move inwardly of the table to its normal position in line with the pins I2. In such position the rule hook I5 may engage in either slot '38 or 39 of the near .plug '28.

Approximately six pairs of these fraction plugs will constitute the -set that will enable .a cutter to cut any fractionalsize-up to %2 of an inch. .Such plugs are not complicated and are easy to setup and will not have to be removed until the cutting of the fractional sizes is completed.

It will be appreciated that the invention is very beneficial to the window glass trade as more and more fractions seem to be-entering the everyday routine It will also be appreciated that with'the use of the improved plugs a window glass cutter is enabled to cut fractional sizes with substantially the same ease as he cuts regular sizes on the standard window glass cutting table.

It will also be appreciated by those skilled in thea'rt that the improved plugs are e'fiicient and accurate and will save a windowglass cutter up to 50% of loss 'of time over previous methods. The plugs :will promote sp'eedand efliciency in the cutting of-glass, particularly for cutting multiple lights of thesame fractional size out of a sheet of window glass; for example 8 x 12 out of a sheet of glass 45 x w'ould bring 35 lights of that fractional size or approximately one half box.

While we have disclosed herein 'the bestform of Q the invention known 'to us at the present time we desire it to :-:be understood that we reserve the tight to make changes 'andmodi fica'ti'ons in the herein described embodiment of the invention provided such changes fall within the 'scope of the following claims.

What is claimed is:

1. "For use with 'a standard glass cutting table havin'g spaced pins at oppositeedges thereof and a standard cutting rule having a tip at its far end and a hook near its handle end, a variable fraction plug device comprising a pair of plugs including a, tip plug and a hook plug, said plugs adapted to engage the tip and hook respectively of the cutting rule, said plugs each having slide blocks constructed and arranged to receive the tip and hook respectively of the rule and slidably mounted in their respective plugs, a fraction scale and index between the plugs and their respective slide blocks for indicating fractional positions of the slide blocks between the pins, and means for holding the slide blocks in adjusted position.

2. A variable fraction plug device as claimed in claim 1 characterized by the fact that the tip plug has substantially vertical holes for receiving adjacent vertical pins of the table, and means to bind the plug upon the table.

3. A variable fraction plug device as claimed in claim 1 wherein a cut-away portion of each plug receives a slide block and such cut-away portion provides lugs projecting from the plug and carrying a bolt on which the slide block slides in the cut-away portion.

4. A variable fraction plug device as claimed in claim 1 in which a bolt mounted in each plug provides the means on which the slide block is slidably mounted and a set screw through the slide block engages the bolt to hold the slide block in adjusted fractional position.

5. A variable fraction plug device as claimed in 6 claim 1 characterized by the fact that the hook plug is provided with vertical slots therein in substantial alignment with the pins at the hook side of the table to receive the hook of the rule when the tip is slid over the tip plug to engage the tip pins on the table.

6. A variable fraction plug device as claimed in claim 5 in which one of the vertical slots is in the central portion or" the hook plug and between adjacent holes for the pins, while another vertical slot is in alignment with a hole for the pin and is exposed through an end wall of the hook plug.

'7. A variable fraction plug as claimed in claim 1 in which the slide block of the hook plug has a set screw for binding the same in adjusted position with a cylinder block rotatably carried by said set screw in position to be engaged by the hook of the rule.

RALPH R. MONDRON. ROMAINE E. MONDRON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

